Rep. Darrell Issa, chairman of the House Oversight and Government Reform Committee, sent a subpoena Wednesday to Attorney General Eric Holder as part of his investigation into the gun trafficking operation known as “Fast and Furious.”

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The subpoena seeks, among other things, all communications regarding the operation from 16 top Justice officials, including Holder, his chief of staff, Gary Grindler, and the head of the department’s criminal division, Lanny Breuer, as well as correspondence on specific dates to and from the former head of the ATF’s Phoenix field division, William Newell.

It also asks for all documents and communications referring or relating to the murder of Immigrations and Customs Enforcement Agent Jaime Zapata, including any correspondence outlining the details of Zapata’s mission at the time he was murdered.